﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Domain.Entities
{
    public class Cart
    {
        private List<CartLine> lineCollection = new List<CartLine>();

        public void AddItem(Product product, int quantity) {
            CartLine line = lineCollection.Where(p => p.Product.ProductID == product.ProductID).FirstOrDefault();

            if (line == null)
            {
                lineCollection.Add(new CartLine { Product = product, Quantity = quantity });
            }
            else { line.Quantity += quantity; }
        }

        public void RemoveLine(Product product) {
            lineCollection.RemoveAll(l => l.Product.ProductID == product.ProductID);
        }

        public decimal ComputeTotalValue() {
            return lineCollection.Sum(p => p.Product.Price * p.Quantity);
        }

        public void Clear() { lineCollection.Clear(); }

        public IEnumerable<CartLine> lines() {
            return lineCollection;
        }
    }

    public class CartLine {
        public Product Product { get; set; }
        public int Quantity { get; set; }
    }
}
